[NTG-context] Draw leftframe to a description

[NTG-context] Draw leftframe to a description

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Hi,

I want to typeset an "excurses" description that is marked with a leftframe. 
The problem is that it spans about multiple pages and has footnotes.

Here is an MWE:
```
%% -> mwe-framedtext.pdf
\defineframedtext[excursusbg][
	frame=off,
	leftframe=on,
	rulethickness=1mm,
	framecolor=blue,
	toffset=0mm,  % there is an offset anyways
]

%% -> mwe-textbackground.pdf
% \definetextbackground[excursusbg] [
% 	location=text,
% 	background=color,
% 	backgroundcolor=lightblue,
% 	frame=on,
% 	loffset=10cm,  % seems to have no impact
% ]

\definedescription[excursus][
	text={Excursus:\ },
	alternative=top,
	headstyle=bold,
	margin=1cm,
	width=broad,
	before={\startexcursusbg},
	after={\stopexcursusbg},
]

\starttext

\input ward

\startexcursus[title={A Knuth extract}]

\input knuth

\stopexcursus

\input ward

\startexcursus[title={A much longer Knuth extract}]

\input knuth
Sometimes, sentences have footnotes\footnote{Some footnote}.

\input knuth
\input knuth

\stopexcursus

\stoptext
```
See the attached PDFs for the different results.

In principal, I would like the excurses typesetted like to solution with 
\defineframedtext. However, this does not work with pagebreaks.
Additionally, the leftframe is too long (it begins above the "Excursus" text). 
I tried toffset to let the leftframe begin exactly at the "Excurses" text 
without success.

The solution with \textbackground looks somewhat promising. It supports 
pagebreaks, but draws above footnotes and prints a small rectangle at the end 
of the excursus. I also didn't found a way to specify a leftframe only.
Also, loffset seems to have no effect, here.

Do I use the false environments? Do you know a better solution?

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